Moisture Content and Extractive Materials in Maritime Pine Wood by Low Field 1H NMR

Labbé, Nicole; Jeso, B. De; Lartigue, Jean-Claude; Daudé, Gérard; Pétraud, Michel; Ratier, Max

doi:10.1515/hf.2002.005

Cited by 51 publications

(54 citation statements)

References 21 publications

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“…In particular, CPMG is a commonly used sequence for determining T 2 relaxation as it reduces effects of magnet inhomogeneity by multiple refocusing of the spins in the transverse plane. Several studies have employed LFNMR for characterising water in both untreated Araujo et al 1992Araujo et al , 1994Cox et al 2010;Flibotte et al 1990;Fredriksson and Thygesen 2017;Labbé et al 2002Labbé et al , 2006Menon et al 1987;Passarini et al 2015;Telkki et al 2013;Elder 2008, 2009) and modified wood (Elder et al 2006;Hietala et al 2002;Javed et al 2015;Kekkonen et al 2014;Elder 2008, 2009). Based on a deconvolution of the decay curves, signals from water in different compartments within the wood structure have been analysed Araujo et al 1992Araujo et al , 1993Fredriksson and Thygesen 2017;Passarini et al 2015) (see Fig.…”

Section: Spectroscopic Techniquesmentioning

confidence: 99%

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

2017

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Water plays a central role in wood research, since it affects all material properties relevant to the performance of wood materials. Therefore, experimental techniques for characterising water within wood are an essential part of nearly all scientific investigations of wood materials. This review focuses on selected experimental techniques that can give deeper insights into various aspects of water in wood in the entire moisture domain from dry to fully water-saturated. These techniques fall into three broad categories: (1) gravimetric techniques that determine how much water is absorbed, (2) fibre saturation techniques that determine the amount of water within cell walls, and (3) spectroscopic techniques that provide insights into chemical wood-water interactions as well as yield information on water distribution in the macro-void wood structure. For all techniques, the general measurement concept is explained, its history in wood science as well as advantages and limitations.

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Section: Spectroscopic Techniquesmentioning

confidence: 99%

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

2017

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“…Low-field nuclear magnetic resonance (LFNMR) has previously been used to study water in wood, both to determine MC (Sharp et al 1978;Hartley et al 1994Hartley et al , 1996Merela et al 2009) and to differentiate between different water states or populations (Menon et al 1987(Menon et al , 1989Flibotte et al 1990;Araujo et al 1992Araujo et al , 1994Labbé et al 2002Labbé et al , 2006Almeida et al 2007;Elder 2008, 2009). The LFNMR approach is decribed by Rutledge (1992).…”

Section: Introductionmentioning

confidence: 99%

“…In LFNMR studies on softwoods, three or four peaks representing different water populations have been identified in water-saturated or green specimens (Menon et al 1987(Menon et al , 1989Flibotte et al 1990;Araujo et al 1992;Labbé et al 2002Labbé et al , 2006Thygesen and Elder 2008). The 1 st peak, generally at <3 ms (Menon et al 1987;Araujo et al 1992Araujo et al , 1994Labbé et al 2002Labbé et al , 2006Thygesen and Elder 2008;Telkki et al 2013) is assigned to the water bound in the cell wall, while peaks with a longer T 2 are assigned to free water.…”

Section: Introductionmentioning

confidence: 99%

“…The 1 st peak, generally at <3 ms (Menon et al 1987;Araujo et al 1992Araujo et al , 1994Labbé et al 2002Labbé et al , 2006Thygesen and Elder 2008;Telkki et al 2013) is assigned to the water bound in the cell wall, while peaks with a longer T 2 are assigned to free water. This differentiation between bound water and free water is made because the former has a T 2 which is constant and independent of MC changes above the fibre saturation point (FSP) (Araujo et al 1992).…”

Section: Introductionmentioning

confidence: 99%

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The states of water in Norway spruce (Picea abies (L.) Karst.) studied by low-field nuclear magnetic resonance (LFNMR) relaxometry: assignment of free-water populations based on quantitative wood anatomy

Fredriksson

Thygesen

2016

Holzforschung

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The states of water in Norway spruce (Picea abies (L.) Karst.) studied by low-field nuclear magnetic resonance (LFNMR) relaxometry: assignment of free-water populations based on quantitative wood anatomy DOI 10.1515/hf-2016-0044 Received February 23, 2016 accepted August 15, 2016; previously published online September 22, 2016 Abstract: Low-field nuclear magnetic resonance (LFNMR) relaxometry was applied to determine the spin-spin relaxation time (T 2 ) of water-saturated Norway spruce (Picea abies (L.) Karst.) specimens cut from mature sapwood (sW) and mature and juvenile heartwood (hW), where earlywood (EW) and latewood (LW) were separated. In combination with quantitative wood anatomy data focusing on the void volumes in various morphological regions, the NMR data served for a more reliable assignment of free-water populations found in water-saturated solid wood. Two free-water populations were identified within most sample types. One was assigned to water in the tracheid lumen and the other to water inside bordered pits. Whether water in the ray cell lumina was included in one or the other of these two populations depends on the curve-fit method applied (continuous or discrete). In addition, T 2 differences between the different tissue types were studied and, for comparison, sorption isotherms were measured by means of a sorption balance. There was a significant difference between EW and LW as well as between juvenile wood and mature wood in terms of T 2 related to the cell wall water. However, no differences were seen between the sorption isotherms, which indicates that the observed T 2 differences were not due to differences in cell wall moisture content (MC).

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“…For instance 1 H MNR was used (Labbé et al 2002) to determine the water state and distribution in maritime pine wood. A somewhat more simple method, using differential scanning calorimetry (DSC), can be employed to determine the state of water and the FSP of various cellulosic materials Kabeya 1993).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of heat-treated wood swelling by differential scanning calorimetry in relation to chemical composition

Repellin¹,

Guyonnet

2005

Holzforschung

131

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Retification is a heat treatment that decreases the swelling of wood and increases its resistance to fungal attack. In this study, differential scanning calorimetry (DSC) was applied in order to determine the fibre saturation point (FSP) of natural and retified wood. FSP values were used to determine the total swelling of natural and heat-treated wood. The DSC method was compared to the volumetric shrinkage approach. The influence of heat treatment temperature and duration on the swelling of wood was investigated. Relationships between chemical changes and the reduction of swelling were analysed thoroughly. The equivalence of the DSC method and the volumetric shrinkage method is shown. FSP in association with anhydrous density is a good indicator for the evaluation of the overall swelling of heat-treated wood. Reduction of wood swelling with increasing temperature and duration of thermal treatment is often attributed to hemicellulose destruction. This study shows that the reduction of beech wood swelling cannot only be attributed to the disappearance of adsorption sites that goes with hemicellulose destruction. It is suggested that other phenomena such as structural modifications and chemical changes of lignin also play an important role.

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Moisture Content and Extractive Materials in Maritime Pine Wood by Low Field 1H NMR

Cited by 51 publications

References 21 publications

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

Experimental techniques for characterising water in wood covering the range from dry to fully water-saturated

The states of water in Norway spruce (Picea abies (L.) Karst.) studied by low-field nuclear magnetic resonance (LFNMR) relaxometry: assignment of free-water populations based on quantitative wood anatomy

Evaluation of heat-treated wood swelling by differential scanning calorimetry in relation to chemical composition

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